Zobrazeno 1 - 10
of 123
pro vyhledávání: '"Takada-Hidai M"'
Autor:
Mashonkina, L., Zhao, G., Gehren, T., Aoki, W., Bergemann, M., Noguchi, K., Shi, J. R., Takada-Hidai, M., Zhang, H. W.
Stellar parameters and abundances of Na, Mg, Al, K, Ca, Sr, Ba, and Eu are determined for four very metal-poor stars (-2.66 < [Fe/H] < -2.15) based on non-LTE line formation and analysis of high-resolution (R ~60000 and 90000) high signal-to-noise (S
Externí odkaz:
http://arxiv.org/abs/0711.4454
Autor:
Frebel, A., Aoki, W., Christlieb, N., Ando, H., Asplund, M., Barklem, P. S., Beers, T. C., Eriksson, K., Fechner, C., Fujimoto, M. Y., Honda, S., Kajino, T., Minezaki, T., Nomoto, K., Norris, J. E., Ryan, S. G., Takada-Hidai, M., Tsangarides, S., Yoshii, Y.
We describe the discovery of HE 1327-2326, a dwarf or subgiant with [Fe/H]}=-5.4. The star was found in a sample of bright metal-poor stars selected from the Hamburg/ESO survey. Its abundance pattern is characterized by very high C and N abundances.
Externí odkaz:
http://arxiv.org/abs/astro-ph/0509658
Autor:
Aoki, W., Frebel, A., Christlieb, N., Norris, J. E., Beers, T. C., Minezaki, T., Barklem, P. S., Honda, S., Takada-Hidai, M., Asplund, M., Ryan, S. G., Tsangarides, S., Eriksson, K., Steinhauer, A., Deliyannis, C. P., Nomoto, K., Fujimoto, M. Y., Ando, H., Yoshii, Y., Kajino, T.
Publikováno v:
Astrophys.J.639:897-917,2006
We present the elemental abundances of HE1327-2326, the most iron-deficient star known, determined from a comprehensive analysis of spectra obtained with the Subaru Telescope High Dispersion Spectrograph.
Comment: 53 pages, 14 figures, 10 tables
Comment: 53 pages, 14 figures, 10 tables
Externí odkaz:
http://arxiv.org/abs/astro-ph/0509206
Autor:
Honda, S., Aoki, W., Ando, H., Izumiura, H., Kajino, T., Kambe, E., Kawanomoto, S., Noguchi, K., Okita, K., Sadakane, K., Sato, B., Takada-Hidai, M., Takeda, Y., Watanabe, E., Beers, T. C., Norris, J. E., Ryan, S. G.
We have obtained high-resolution (R $\simeq$ 50,000 or 90,000), high-quality (S/N $\ga$ 100) spectra of 22 very metal-poor stars ([Fe/H] $\la$ -2.5) with the High Dispersion Spectrograph fabricated for the 8.2m Subaru Telescope. The spectra cover the
Externí odkaz:
http://arxiv.org/abs/astro-ph/0402291
Autor:
Honda, S., Aoki, W., Kajino, T., Ando, H., Beers, T. C., Izumiura, H., Sadakane, K., Takada-Hidai, M.
Publikováno v:
Astrophys.J. 607 (2004) 460-473
We present the abundance analyses for the neutron-capture elements, and discuss the observed abundance distributions in very metal-poor stars with excesses of r-process elements. As has been found by previous abundance studies, the star-to-star scatt
Externí odkaz:
http://arxiv.org/abs/astro-ph/0402298
Autor:
Aoki, W., Ando, H., Honda, S., Iye, M., Izumiura, H., Kajino, T., Kambe, E., Kawanomoto, S., Noguchi, K., Okita, K., Sadakane, K., Sato, B., Shelton, I., Takada-Hidai, M., Takeda, Y., Watanabe, E., Yoshida, M.
We have obtained a high resolution (R~90,000) spectrum of the carbon- and s-process-element-rich, very metal-poor ([Fe/H]=-2.7) subgiant LP625-44, as well as that of HD140283 (a metal-poor subgiant with normal abundance ratio) for comparison, with th
Externí odkaz:
http://arxiv.org/abs/astro-ph/0204117
Autor:
Mazzali, P. A., Deng, J., Maeda, K., Nomoto, K., Umeda, H., Hatano, K., Iwamoto, K., Yoshii, Y., Kobayashi, Y., Minezaki, T., Doi, M., Enya, K., Tomita, H., Smartt, S. J., Kinugasa, K., Kawakita, H., Ayani, K., Kawabata, T., Yamaoka, H., Qiu, Y. L., Motohara, K., Gerardy, C. L., Fesen, R., Kawabata, K. S., Iye, M., Kashikawa, N., Kosugi, G., Ohyama, Y., Takada-Hidai, M., Zhao, G., Chornock, R., Filippenko, A. V., Benetti, S., Turatto, M.
Publikováno v:
Nucl.Phys.A718:569-571,2003; Astrophys.J.572:L61-L65,2002
Photometric and spectroscopic data of the energetic Type Ic supernova (SN) 2002ap are presented, and the properties of the SN are investigated through models of its spectral evolution and its light curve. The SN is spectroscopically similar to the "h
Externí odkaz:
http://arxiv.org/abs/astro-ph/0204007
Autor:
Takada-Hidai, M., Takeda, Y., Sato, S., Honda, S., Sadakane, K., Kawanomoto, S., Sargent, W. L. W., Lu, L., Barlow, T. A.
LTE and NLTE abundances of sulfur in 6 metal-poor giants and 61 dwarfs (62 dwarfs, including the Sun) were explored in the range of -3 \lsim [Fe/H] \lsim $+0.5$ using high-resolution, high signal-to-noise ratio spectra of the \SI 8693.9 \AA and 8694.
Externí odkaz:
http://arxiv.org/abs/astro-ph/0103481
The abundance of oxygen was determined for selected very metal-poor G-K stars (six giants and one turn-off star) based on the high S/N and high-resolution spectra observed with Keck HIRES in the red through near-IR region comprising the permitted O I
Externí odkaz:
http://arxiv.org/abs/astro-ph/0007007
Autor:
TAKADA-HIDAI, M., AIKMAN, G. C. L.
Publikováno v:
Publications of the Astronomical Society of the Pacific, 1989 Aug 01. 101(642), 699-704.
Externí odkaz:
https://www.jstor.org/stable/40679385
